(make) Add some parameters to makefile.
(make) Add some parameters to makefile.

- "make kill" is now a synonym for "make war".
- Renamed "pthread_test" to "matmult_test".
- You can specify the number of cores for pthread_matmult by setting
  "CORES" on the command line. Example: "make matmult_test CORES=9".
- Similarly, you can specify the process to kill using "make kill" or
  "make war" by setting "PROCESS" on the command line.

mit-carbon/Graphite,victorisildur/Graphite,mit-carbon/Graphite-Cycle-Level,nkawahara/Graphite,fhijaz/Graphite,8l/Graphite,victorisildur/Graphite,mit-carbon/Graphite,victorisildur/Graphite,fhijaz/Graphite,nkawahara/Graphite,mit-carbon/Graphite,mit-carbon/Graphite-Cycle-Level,fhijaz/Graphite,8l/Graphite,mit-carbon/Graphite,8l/Graphite,victorisildur/Graphite,mit-carbon/Graphite-Cycle-Level,mit-carbon/Graphite-Cycle-Level,fhijaz/Graphite,nkawahara/Graphite,nkawahara/Graphite,8l/Graphite